Apparatus for separating the constituents of pulp



April 16, 1929, T. G. MARTYN I 1,709,676

APPARATUS FOR SEPARATING THE CONSTITUENIS OF PULP Filed Dec. 24, 1926 2 Sheets-Sheet 1 Aprill6, 1929. T. ca. MARTYN APPARATUS FOR SEPARATING THE CONSTITUENTS OF PULP 2 Sheets-Sheet Filed Dec. 24. 1926 1-1; l1 .3 I nlnunl .u: .1. u-

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' panying drawing in which ii atented Apr. 36, E9 29.

E star r' error as GRAHAM TEARTYN, nncnasnnlnmrn or FORDSBURG. aorraunnsnune, soirrn arnica, BY ennrnuns ELLEN MAETYN, nxncurnrx, or ronnseuna-a'olraunns. BUEG, scorn AFRICA. v

trait APPARATUS FOR SEPARATENG THE CQNS'IITUENTS OF PULP.

Application filed. December 24, 1925, Serial No. 1565970, and in Union of South Africa January '7, 1926.

The nresent invention relates to the treat ment or pulp for the separation of constituents having a tendency to separate gravitationally from it by either rising or falling.

The invention is thus applicable to the dewatering or thickening of pulp; the remoyal of slime from mixed pulp and the separation from pulp of constituents rendered buoyant, for flotation separation.

According to this invention the pulp is aused to flow substantially horizontally between confining surfaces inclined to the ver-- tical and spaced a short distance apart. The result is that a particle which gravitates across the stream, by either rising or falling, comes into contact with one of the confining surfaces after it has travelled a short dis tance. At such confiningsurface the velocity of the stream is lower than the velocity in the main section of the stream owing to the frictional resistance offered by the surface to the flowing liquid. Consequently, onreaching the surface, the particle is to a material extent shielded from the carrying effect of the flowing stream, and is free to continue its movement towards a point out of the stream by sliding gravitationally up or down the confining surface.

By multiplying the number of confining surfaces, any desired volume of flow may be attained without varying the velocity of the stream and without increasing the distance through which a particle has tov travel before being shielded from the stream.

The inventio is illustrated in the accomapart to provide settlement chambersll between them. The upper edges 12 and the lowor edges 13 of the partitions are horizontal.

IT, inclined to the vertical at an angle suitable to cause sand to gravitate down them. -The partitions of the set 8 are parallel to one anotherand to the ma 3 of the box. Those of set 9 are similarly parallel to one another and to the wall t of the box. I

The inclined edges let of the partitions are opposite inclined edges 16, are similarly spaced from the wall 6'to form an outlet ehamber-17.. 3

,chai'nbers ll to the outlet chamber 17. In flowing between the partitions, it is subdi vided into sheets, whi-ch, for sand settlement, may each be about 2 inches thick. Particles reaching the lower surface of the settlement chamber in which they happen to be, slide down said surfacet-o its lower edge 13. The

collecting. chamber 18, in which san-d particl es fall to the slot 7'; to be thereafter furthe treated in the sorting apparatus 19. v

The path Offl settling sand particle may be representedras in Fig. IV in which the line A-B is the path of fall through the sheet; the line BC the path of slidingdown the partition and the line CD the path of fall through the chamber 18. On reaching B and in traversing 13-0 the particle is substantially free from the carrying effect of the stream. In the path CD the particle is I out of the stream, although C may be above the bottom of the stream as awhole. It will thus be seen that whatever the depth of the stream. thedistance AB viz the vertical distance between two adjacent partitions,lis the maximum distance which any to fall through the flowing pulp.

Floatable matter rises out of the subdivided streams and gravitates along the upper bounding surfaces of the chambers 11 to the surface oft-he liquid in the box 2. The top edges 12 of the partitions are preferably sub- Fig. I is a general view of an apparatus in. which the invention is employed to separate slime from sand prior to sorting the latter.

Fig. II is a vertical cross section. v

Fig. III is a vertical longitudinal section on III-III Fig. II.

Fig. IV is a diagram. 1

Fig. V is a. vertical section of another form of the invention.

Fig. V1 is an end view of Fig. V, with the cover removed, seen from the direction of the arrow A in Fig. V. V

Fig. VII is a section on VII-VII Fig. V.

Referring to Figs. 1 to HT 2 indicates a box having walls, 3, at, 5, 6, converging to a discharge slot 7 Y 7 Within the box are two sets 8, 9 of thin partitions 10; whichv partitions arespaced All the partitions are, as seen in Figs. I and spaced :away from thei wall 5 of the box to leave between them a feed chamber 15. The

The pulp to be; treated flows from the feed chamber 15 through thes'ets of settlement I of sand sink through the sheets; and upon lowercdges 13 of the two sets of partitions are separated to form between them a sand.

particle has merged to facilitate skimming of the buoyant matter from the surface of the liquid. 7

It is preferred to control the inflow and 'out flow of liquid to and from the settlement chambers 11 and to promote an even flow through allsaid chambers, by means of end baflies 20, 21 which may also space the partitions from one another. Said baflies are perforated respectively at 22 and 23 to permit limited flow through them. The perforations 22 of the incoming battles are at the bottom .of the'baflies and those 23 of the outgoing baflies are at the top. This arrangement prevents direct currents across the chambers 11.

It also assists scouring away of sand which may bank up at the incoming ends of the chambers 11 and prevents the scouring away of fine sand which settles at the outgoing ends of said chambers.

The pulp is fed through a grating 24 into a hopper 25, and thence passes into the feed chamber 15 behind a bal'lle 26 which tranquilizes the flow and assists to distribute the pulp vertically.

The pulp passes around the edges 27 of the bafiles 26, and it is preferred to bring said edges fairly close to the side walls 3, l, of the box in order to scour the adjacent corners of the box and prevent solids from banking therein. Thc'ends 30 of the sand collecting chamber 18 are closed to prevent direct .access of pulp to said chamber.

"The apparatus shown in Figs. V to VII 1s suitable for dewatering slime and clarifying liquids, and is so constructed that it may form part of a. system under pressure or vacuum. It consists of a circular vessel 31 fitted with'end covers 32. Rectangular partitions 10 are arranged in the vessel parallel discharg pipe 39.

passing to .the outletchamber 3e to the Perforated baffles 20, 21 similar to those described above are provided at the ends of the settlement chambers 11.

l. Apoaratus for separating the constitir' cuts of pulp, comprising inclined upper and lower boundary members providing between them an inclined settlen'ient chamber, means to feed pulp in at one inclined end of said chamber and to withdraw pulp from the other inclined end of said chamber and thereby cause pulp to do w substantially horizontally across the chamber, baffles. at the inclined ends of the chamber controlling the flow of pulp into and from the said chamber, and means to collect material which'gravitates out of the settlement chamber; 1

2.. Apparatus forseparating the constituents of pulp, comprising inclined upper and lower boundary members providing between them an inclined settlement chamber, means to feed pulp in at one inclined end of said chamber and to withdraw pulp 'fronirthe other inclinet. end of said chamberand thereby cause pulp to flow substantially horizontally across the chamber, a battle at the inclined inlet end of the settlement chamber arranged to admit pulp near to the lower boundary member thereof, battle at the inclined outlet end of the settlement chamber arranged to discharge pulp near to the upper.

boundary member thereof, and means .to col lect material which gravitates out of, the settlement chamber. 2 I

In testimony whereof I aflix my aturev GERTRUDE ELLEN MA RTYN, EmGt-ll fim Tcat/mzca/ arg for Thom as Gmlzmn Marty a, Deceased. 

